"We've just made a great Internet service even better," Lisa Washa, vice president and general manager of Charter's operations in Wisconsin, said in a statement. "Not only are we delivering a very fast speed today, but our network has the capacity to support even higher speeds as demand and usage grow."

There was no word on when Charter might offer its 60 Mbps downstream Internet service - the fastest residential service available from any telecom company in the U.S. - here. The company began offering that service in its home market of St. Louis earlier this year.

Charter said in January that it expected to enter other markets with the service, which will provide upstream speeds of up to 5 Mbps, later this year.

The "Ultra60" service costs $129.99 per month bundled with TV or phone and $139.99 per month as a standalone service.